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34 lines
961 B
34 lines
961 B
export const tests = [] |
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const t = (f) => tests.push(f) |
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const isConst = (name) => { |
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try { |
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eval(`${name} = 'm'`) |
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return false |
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} catch (err) { |
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return true |
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} |
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} |
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// arr |
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t(() => Array.isArray(arr)) // arr is declared and is an array |
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t(({ eq }) => eq(arr[0], 4)) // arr first element is 4 |
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t(({ eq }) => eq(arr[1], '2')) // arr second element is "2" |
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t(({ eq }) => eq(arr.length, 2)) // arr length is 2 |
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// obj |
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// obj is declared and of type object |
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t(() => obj.constructor === Object) |
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// obj is constant and can not be re-assigned |
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t(({ fail }) => obj && fail(() => (obj = 10))) |
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// obj.str is of type string |
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t(() => typeof obj.str === 'string') |
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// obj.num is of type number |
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t(() => typeof obj.num === 'number') |
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// obj.bool is of type boolean |
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t(() => typeof obj.bool === 'boolean') |
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// obj.undef is of type undefined |
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t(() => 'undef' in obj && typeof obj.undef === 'undefined') |
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// check if all variable are const |
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t(() => ['arr', 'obj'] |
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.every(isConst))
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